Malicious PDF — malware analysis report

Static analysis result for SHA-256 2425df15260ca60a…

MALICIOUS

PDF

73.9 KB Created: 2021-04-05 09:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac46b33fde02a1bf1f590fed14a3dcaa SHA-1: 747143cdb76c30b4ec30b5f7f0a508fe1c3b446c SHA-256: 2425df15260ca60a7e9497ff650d11ca05831ea6233a22bbd6de24cffd1df0b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/123?utm_term=wisconsin+child+care+background+check+form PDF link annotation
    • http://gojoges.iblogger.org/ladiwigeb.pdfIn PDF document text
    • http://zuviferufudufa.iblogger.org/discal_cyst_case_report.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/hcvjbHR/idle_evil_clicker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/hgehg1P/40879370982.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/bie5t68/download_game_angry_shark_2016_mod_apk_offline.pdfIn PDF document text
    • http://gapofar.22web.org/40892071814.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/bhiUjjE/91765533929.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/igdhcH9/chex_quest_download_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/hhWZrib/harris_jayaraj_telugu_songs_collection.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/9liiL9m/shooting_games_for_ps4_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/euhe8jj/describe_endospore_formation_and_germination.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/heDYhiI/minesweeper_beginner_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/kheghgj/brahman_definition_philosophy.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/e6ijihg/yandere_dragon_x_reader_lemon.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/gfk80QI/digital_concert_hall_berlin_philharmonic.pdfIn PDF document text
    • https://cdn.sqhk.co/tasewapimol/Fhageig/91981049991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_0c934749ecfc407fb675b4e5077964b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1d0b9a-7db7-4660-a25d-f36f30f918b0/84447075417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3918287-d614-4df9-8711-6190f1728af9/how_old_were_actors_in_white_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2519e4dc-a290-4395-a9ad-f4a3d4640301/2005_cadillac_cts_v_engine_for_sale.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_b625e5e7bf544709b278d9272c17854a.pdf?index=trueIn PDF document text
    • http://xeravujowa.epizy.com/wowuxu.pdfIn PDF document text
    • http://valogaberel.rf.gd/white_mug_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61df1ee-9806-42de-a2e7-368cc107e482/old_navy_customer_service_pay_bill.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_f79ca356fd214d18ba4708e4293396d6.pdf?index=trueIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_d617b17514ec49b19f5a66bf89b74e37.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_458593bbbd934ab2b0efd5ea153798ba.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 5652 bytes
SHA-256: 9e8691a17fbbdf363ab8fa3f0b35e6f16128f7bf6d8409ea97539e995b9c660a
font_01_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10852 bytes
SHA-256: 6045c03d28d0740948b4bc977ab9f619ef0709001c4e115471be02eac3aa47f0